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mathlab from the mathlab github repository (It might take a couple of seconds...):
Object.keys(mathlab)
inv calculates the inverse of a matrix.
mathlab.inv([[1,2],[3,4]])
And here is what happens when the matrix is not invertible:
mathlab.inv([[1,2],[1,2]])
dot calculates the dot product of a matrix.
mathlab.dot([[1, 1], [2, 1]], [1, 2])